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The Control Panel app reports: E7200 @ 2.53GHz 1.90 GHz.

Seems odd to me.

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migrated from stackoverflow.com Apr 24 '11 at 11:50

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2 Answers

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Windows just displays it that way: [Name] @ [Max speed]GHz [Current Speed]GHz.

Like Sathya said, the current speed can change on the fly for power savings.

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I like this answer. I have always assumed that the two figures represented a core each. But to test Louis' answer, I checked one of my quad-core machines--only two figures! So, let's presume that it is correct that the second figure represents the actual speed at this moment rather than maximum speed. –  Michael Broschat Apr 24 '11 at 18:58
    
What you see in the in the System panel isn't real time. If you're really curious check out CPU-Z for speeds, and CoreTemp for how hot it's running. GPU-Z for your video card has temps, speed and more information as well. –  Louis Apr 24 '11 at 19:35
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Core 2 Duo E7200 comes with SpeedStep enabled.

SpeedStep [...] allow(s) the clock speed of the processor to be dynamically changed (to different P-states) by software. This allows the processor to meet the instantaneous performance needs of the operation being performed, while minimizing power draw and heat dissipation. Enhanced Intel SpeedStep is sometimes abbreviated as EIST

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Well, this is not a laptop. It has constant power. Even if SpeedStep were involved, why would there be two different speeds? –  Michael Broschat Apr 24 '11 at 12:40
    
@user78102 whether it is laptop or not is irrelevant, all modern Intel( and AMD) processors come with dynamic frequency scaling - the rated speed (which the processor runs at during full load) and an idle speed. This is to reduce heat & power consumption –  Sathya Apr 24 '11 at 13:22
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